Tom C. and a few others asked about the T3 (and T9) "No-Ad" back. An example is attached.
As you can see, it's been called the "no-ad" because all of the redemption information usually seen on the bottom of the card is missing.
On my website -
www.t3turkeyred.com - I have a page dedicated to T3 back variations in general as well as one showing a group of "no-ad" backs
Most collectors don't think of backs when collecting T3s, but these are extremely rare. I've been tracking them down for more than 20 years, buying (or trying to buy) nearly every one I've come across. There are still a few that I've never seen.
Happy collecting,
Craig